Lamp support



' Nov. 17, 1925- T. F. UHLEMANN LAIP SUPPORT Original Filed July 2, 1920 Patented Nov. 17, 1925.

UNITED STATES PATENT OFFICE.

THEODORE F. UHLEMANN, OF GLEN MORRIS, NEXV YORK, ASSIGNOR T0 NICHOLAS POWER COMPANY, INC., OF NEW YORK, N. Y., A COREORATION OF DELAWARE.

LAMP surronr.

Application filed July 2, 1920, Serial To all whom it may concern:

Be it known that I, THEODORE F. UHLE- MANN, a citizen of the United States, and a resident of Glen Morris, Queens County, Long Island, New York, have invented new and useful Improvements in Lamp Supports, of which the following is a specifi-. cation.

This invention relates to a quick detachable support for incandescent lights, particularly for lights'of high amperage such as used for the projection of motion pictures in lieu of the customary are light.

The object of the invention is to provide a support having a detachable portion which may be withdrawn with a burned out lamp and an interchangeable part containing a fresh lamp inserted in a moments time, and in which the lamp and detachable part are rotatably adjustable in the fixed portion of the support to bring the filaments of the lamp into proper relation to the refiector.

In the use of incandescent lights for projection it is necessary that the lamp, whose filament is supported in a plurality of, close coils arranged in vertical rows in a single transverse plane of the bulb, be adjusted with the plane of the filaments transverse of the optical axis of thereflectorand so positioned with respect to the focus of the reflector that the reflected images of each filament will lie in the spaces between the actual filaments, whereby the whole forms a uniformly illuminated area equal to the overall dimensions of the several filaments. It is also necessary that means be provided to quickly substitute a new lamp for the one that burnsout, as otherwise a delay during the projectionof the film is liable to occur of such duration as to detract materially from the exhibition.

My improved lamp sup ort embodies both these features in a simp e and easily con=' structed device of low manufacturing cost.

and which is also easily operated and durable and serviceable.

In the accompanying drawings I have illustrated two forms of my improved structure. In, the said drawings,

Figure 1 is a vertical sectional view of one type of my quick detachable support, the lamp bein shown in elevation;

Fig. 2 is a p an view of the structure with N0- 393,603. Renewed April 11, 1925.

the screw-threaded lamp receptacle de tached;

Referring to the drawings, particularly Figs. 1 and 2, 1 indicates a metal base plate to be fixedly attached in any suitable manner, not shown, within the lamp house or other support for the lamp. The base plate 1 has a central neck 2 in which fits a corresponding neck 3 of a cup I of fibre or other insulating material, the cup being fixedly attached to the base plate.

The neck 3 is bored to receive the stem 5 of a turn-table 6 also of insulating material and set in a recess in the bottom of the cup for free rotation therein with its face flush with the surrounding margin of the cup bottom. The table G is not only freely rotatable in the cup, but may be vertically withdrawn and an interchangeable table inserted without using. tools of any kind, except that if desired a set screw 7 may be used to hold the table in its adjusted position. 7

Attached to the face of the table 6 is a screw-threaded incandescent bulb socket 8, the socket being supported on a metal shoe 9 of the shape shown in Fig. 2, that is, the shoe is of generally circular shape but cut away on one side. The screw-threaded socket is cut away at the bottom below its threaded portion to the same extent to admit the contact piece 10 for the middle terminal of the lamp. This contact piece consists of a flat bottom strip attached to the turntable and extending radially of it with a button 11 projecting upwardly at the center of the table to be engaged by the terminal of the lamp when the bulb is screwed home in the socket. The'other endv of the strip consists of an upturned arm 12 terminating at its upper end into a wiping contact piece 13 designed to press against a contact ring 14 set in an annular groove in the vertical wall of the cup 4 and provided with 14 and provided with a connector terminal 18 tor the other cable of the electric circuit.

in using my improved support the base plate 1 is fixedly attached within the lamp house and the terminals 15 and 18 connected to a suitable source of current. At least two disks or turn-tables (i are provided and into each a lamp bulb will be screwed until its center contact is held tight against the contact button ll of the conductor it). The bulb with the attached turn-t ble (3 will then be inserted ii to the support in the ma ner shown in the drawings. in which position the entire bulb and turn-table may be aujusted to bring the filaments 21, into the proper position with relation to the reflector 20, that is, with their common plane at right angles to the optical axis or the re tiector. The set screw 7 may be used to lock the turn-table in adjusted position, but for convenience ot substituting a fresh bulb a set screw need not be employed, particularly as the contact plates 13 and 16 have suihcient frictional engagement with the conductor rings to hold the bulb against accidental displacement.

In case the bulb in use-burns out it is only necessary to lift out the bulb with its attached socket and turn-table and insert a fresh bulb with its own socket which may be easily turned to bring the filaments into proper position with respect to the reticetor.

In Figs. 3 and l: I have disclosed a somewhat modilied torm o't construction for accomplishing the same purpose. .lin this torm ot the device the lixed base plate 1 is pro vidcd with a cup which in turn is novided with a central plug 23 having a bore at its center lined with insulating material 23, which material terminates in a cap 2t covering the upper "ace of the plug. the up per surface of the cap lying somewhat helow the upper edge at the rim.

Attached to the upper edg re ot' the cup is an annular metal plate 25 carrying a log); 26 to which one terminal ot the electric circuit will be connected. The plate 25 is prwxided at opposite points with slots 27 extending from the central opening of the plate to the margins thereof, the slots 2? being arranged to receive tongues 28 carried by the annular shoe 29 supporting the lamp socket 530.

The shoe 29 has a hole in the middle of la ger dimensions than the middle contact of the lamp, and arranged to engage the middle contact of the lamp when the bulb is in place is a spring-pressed pin 31 workingin the bore oil the insulating piece 23 and projecting through the botton'i oi the support in position to be engaged by a current-carrying spring 32 leading to the other terminal, not shown, of the electric circuit. The spring 32 presses the head of the pin 31 against the lamp terminal and also raises the lamp socket carrying base 29 against the conductor plate to hold the bulb in whatever position it may be set. A washer 29 is provided between the annular shoe :35) and the cap 24: or the insulating piece 22;. The thickness of this washer 29 is substantially equal to that 01 the head of the springprt 31.

In this form of the device the annular shoe 29 and the threaded socket 30 are the only parts which need to be duplicated in order to have a quick interchangeable bulb in case one burns out. The tre'sh bulb will be set in its socket so that the filament is in about the same plane as the tongues so that when the bulb with the attached socket is set in the fixed cup it will require about a quarter turn to bring the plane of the filaments into the proper position with relation to the optical axis of the reflector in which position the tongues will be remote from the slots 27 in the plate and there will be no danger of accidental loosening of the bulb socket. The spring 32 is strong enough to hold the bulb tight in the socket support and insure a good contact between both terminals of the lamp and their conductors, as will be readily understood.

It will of course be understood that Various changes in the construction of the device other than those described may be made without departing from the spirit of the invention, as defined in the appended claims.

I claim:

1. A support for incandescent lights comprising a fixed part, a turntable supported thereon tor rotary adjustment, a receptacle for the light bulb supported on said turntable at the center of the receptacle in alinement with the axis of the turntable. a contact supported on said turntable in position to be engaged by one terminal. oi the lamp bulb and electrically insulated from the said receptacle, an electrical conductor connected to said receptacle, fixed conductors mounted on said fixed part, and wiping contacts be.

tween the conductors on said turntable and said fixed conductors. I

2. A quick detachable support for incandescent lights comprising a fixed part, a turntable supported therein for rotary a d justment, said turntable being freely removable from said fixed part, a receptacle for an incandescent light bulb supported on said turntable, a conductor independent of said receptacle and insulated therefrom also supported on said turntable, said conductor being positioned to engage one terminal of 7 said electric light bulb when in said receptacle, a second conductor on said turntable, fixed contacts mounted on said fixed part, and connected to said receptacle, and Wiping contacts between said conductors and said fixed contacts.

3. A quick detachable support for incandescent lights comprising a cup-shaped member of insulating material, annular conductors set in the Walls of said cup and electrically insulated from each other, a turntable supported in said cup for rotary adjustment, a lamp receptacle attached to said turntable and being in electrical connec tion with one of said annular conductors, and a contact carried by said table in position to engage one terminal of the lamp when set in said receptacle, said contact being insulated from the receptacle and having a Wiping contact With the other of said annular conductors.

at. In a support of the type described, the

combination of a cup-shaped fixed portion of insulating material, annular conductors supported thereon, a rotary adjustable part associated with said fixed part and detachable theret'rom, a lamp receptacle rotatable With said rotary part, said rotary part having a Wiping contact with one of said annular conductors, and a contact adapted to engage the other terminal of said lamp, said contact being insulated from said receptacle and having a Wiping contact with the other of said annular conductors.

Signed at New York in the county of New York and State of New York, this 2nd day of June, 1920.

THEODORE F. UHLEMANN. 

